Among the principle findings:
- Active shooter incidents increased in frequency. There were on average 6.4 incidents per year in 2000 - 2006, rising to an average of 16.4 incidents in 2007 - 2013.
- There were 1,043 casualties (486 killed, 557 wounded—excluding the shooters).
- Six of the 160 incidents involved a female shooter.
- 158 of 160 incidents involved just one shooter.
- 64 incidents fall within the federal definition of mass killing—three or more killed in a single incident
- 107 incidents ended before police arrived
- 90 shootings ended on the shooter’s initiative by suicide or flight.
- 21 incidents ended after unarmed citizens restrained the shooter.
- Four incidents were interrupted by armed security guards or off-duty law officers.
- One incident was ended by a citizen with a valid firearm carry permit.
- In the 64 incidents where duration could be determined, 44 ended in five minutes or less, 23 of those in two minutes or less.
- In 21 of the 45 incidents where law enforcement engaged the shooter, nine officers were killed and 28 were wounded.
- Active shooter incidents occurred in seven environments
- 73 incidents occurred in commercial environments
- 39 took place in educational environments
- 16 were in government facilities
- 15 were in open spaces
- seven in residences
- six in houses of worship
- four in health care facilities.
* Active shooter incidents are distinguished from "ordinary" murders by the active and public nature of the crime
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